Features Work with the indoor ventilation system: the indoor ventilation system can be intelligently adjusted according to the carbon dioxide concentration tested by the sensor to make the indoor air more comfortable and suitable for life. Accurate measurement: this CO2 sensor can accurately measure the carbon dioxide content in the air, you can use it without hesitation! Dual use: this CO2 sensor can also be used to measure temperature and humidity, with carbon dioxide content and temperature measurement, very practical tool! Easy Installation Due to its compact size and light weight, the easy installation can be completed quickly. Wide Application This CO2 sensor can be used in homes, botanical gardens, bookstores, offices, buses, etc. to measure the carbon dioxide content. Specification: Item Type: Gas Sensor Module Material: PCB. Supply voltage range: 2.4-5.5V Measuring range: 400 to 5000 ppm Accuracy: ± 40 ppm. Relative humidity measurement range: 0 to 95% RH Typical relative humidity accuracy: 6% RH Package list: 1 x gas sensor module, 1 x pin header Package List 1 x Gas Sensor Module 1 x Pin Header